The hiker prepares trail mix for his group hike. This includes nuts that cost 3.99 per pound and pretzels that cost 1.29 per pound. 20 pounds of the mix is made such that it costs 2.37 per pound.

Let the number of pounds of nuts used be X, 20 - X pounds of pretzels are used.

`(3.99*X + 1.29*(20 - X))/20 = 2.37`

=> 3.99*X + 1.29*(20 - X) = 47.4

=> 3.99*X + 25.8 - 1.29*X = 47.4

=> 2.7*X = 21.6

=> X = 8

**The mix has 8 pounds of nuts.**

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